Hello there, this header problem is because if installer doesn't find the index.php or plugin-name.php file inside the zip file. What you can do is to download the zip file and then unzip it. You may find the plugin is nested inside multiple folder, this is causing the problem. Now you need to find the woocommerce-epdq folder and upload it via ftp. Or you can simply zip that folder and install is via the plugin installer of WordPress. Thanks for your feedback.